One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,10)(8,9)(11,12)(13,14,18,23)(15,25,16,20)(17,24,19,22)(21,26,28,27)(1,2)(3,4)(6,9)(7,11)(13,15,18,16)(14,20,23,25)(17,27,19,26)(21,24,28,22)(2,4)(13,16,18,15)(14,21,23,28)(17,27,19,26)(20,24,25,22)(6,9)(10,12)(13,17,18,19)(14,22,23,24)(15,26,16,27)(20,28,25,21)(2,4)(5,7,8,11)(6,10,9,12)(15,16)(20,25)(21,28)(26,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.